Description of Electrical Controls
Control Transformer: The control transformer is rated at 24
vac, 40 va (1.6 amps @ 24vac).
Pump Bypass Timer: The pump bypass timer is a 24 vac, 3-
wire control. When energized the timer will bypass the flow
switch for 10 seconds by creating a circuit to the pump relay,
energizing the pump relay, and allowing the pump to operate
long enough to close the flow switch. In a normally operating
system, the flow switch will stay closed powering the pump
relay in series with the low and high pressure switches. Should
the flow switch open, the timer can only be reset by opening
and closing the chiller's line voltage disconnect.
System Delay Timer: The refrigerant timer is a 24 vac, 5-
minute delay on break timer. The normally closed contacts of the
timer energize the compressor contactor through the chilled
liquid solution control. When the chilled liquid solution control
contact opens, the timer delays by opening its contact for 5
minutes before resetting to the closed position.
High Pressure Switch: The high pressure switch is an
automatic reset control that senses compressor discharge line
pressure. It opens at 400 PSIG and closes at 300 PSIG.
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